Curtis Lum

Elena is drawn to Stefan, a handsome and mysterious new student; Vicki is attacked at a party; Stefan learns that his evil older brother has returned.

Ben finds a strange sound-emitting device on the North Star that could potentially lead him to Chris.

Alec and the team head to Las Vegas to help Camille, a former colleague turned expert poker player who's been lured into danger, and they must take some risks to solve a gambling mystery before Camille gets hurt; Marisa makes a significant discovery.

The military facility is on high alert, and while Chris manages to escape, he is not the only one to make it out.

Ben investigates some suspicious overfishing; Decker increases his efforts to find his escaped mermaid and shows the true extent of his influence.

Maddie rushes to Ryn's rescue after she is taken in for questioning. Ben and Xander return to the deep sea in search of answers, but are met by an uninvited guest.